Valve-grinding tool



Dec. 9

NVENTOR AIEL\\\\\ o. D. HAPGOOD VALVE GRI NDING TOOL Filed Aug. 25, 1922ATTQBNEY Patented Dec. 9, 1924.

p '3 t raw; i an; it a i.

y n cryp 's OSCAR D. HAPGGQD, 0F MONTAG'IIE, IvIi'LSSACH'USETTS,ASSIGNOB TO GOODELL-PRATT COMPANY, 0F GREEHFIELD, MASSACHUSETTS.

VALVE-GRINDING T0014.

Application filed August 25, 1922.

To (all whom it may concern.

Be it known that l, Osonn D. Hareoon, a citizen of the United States ofAmerica, residing Montague, Massachusetts, have invented new and usefulImprovements in Valve-Grinding Tools, of which the following is aspecili -ation.

This invention relates to improvements in tools, the principal object ofthe invention being to provide an improved tool especially adapted forvalve-grinding, in which the motions of an operating handle can be transmitted to the valve-engaging blade evenly and with great smoothness, andwhich tool is simple in construction, economical to manufacture, andvery eliicient in its operation.

With the foregoing and other objects in view, which will appear as thedescription proceeds, the invention consists in the novel features ofconstruction and combination of parts which will be more fully describedhereinafter and particularly pointed out in the claims.

In the drawings accompanying and forming part of this specification,

Figure 1 is a partly sectional side elevation of a tool embodying thepresent invention;

Fig. 2 is a side elevation of said tool taken at right-angles to Fig. 1,the operating lever being shown broken away;

3 is a transverse section on a larger scale, taken on the line 33 ofFig. 1; and

Fig. 4 is a bottom, plan view illustrating the connection of thewoiur-engaging-blade carried by the tool.

The same characters of reference designate the same parts in thedifferent figures of the drawings.

Referring to the drawings, 2 designates a tubular shell or housinghaving secured in its upper end an enlarged head 3, preferably of wood,and in its lower end a flanged bearing sleeve 4, in which is mounted forrotation a shaft 5. llhe shaft has secured to its lower end a tool chuck6, the upper end of which is flanged in a manner similar to the bearingsleeve 4i and adapted to abut against the lower end of said bearingsleeve, said chuck and bearing sleeve being provided in their abuttingfaces with alined annular 'rooves adapted to form a raceway for balls 4.The ball-bearing thus provided eliminates any longitudinal pressure orend thrust on the shaft.

Serial No. 584,221.

The shaft 5, at its upper portion, has formed thereon a plurality ofspiral threads 5 adapted to engage a similarly threaded opening in amember 8 located within the housing and adapted to reciprocate therein.Elie reciprocatory member has formed on one side thereof an elongatedportion 9 which is provided with ratchet teeth that project through anelongated slot 10 formed in the housing.

Mounted on the outside of the housing and removably secured thereby bymeans of a screw 11, is a strap member or stirrup comprising acylindrical portion 12 encircling the housing and merging into a pair ofradially extending legs or brackets 13 adapted to support a gear 14 inmesh with the ratchet teeth of the reciprocatory member 8, said gearbeing mounted for rotation on a stud 15 secured in the brackets 13.

' Attached to the gear 14: in any suitable manner is an operating handle16, by means of which the gear may be rocked on its pivot, thereby toreciprocate the member 8 and cause rotation of the shaft alternately inopposite directions. The relation between the raclr, gear and the spiralthreads on the shaft is preferably such tha for each complete movementof the member 8 in one direction the shaft is rotated approximately oneand one-half revolutions.

In the structure herein illustrated, a valvegrinding blade 17 of usualconstruction is removably secured between the jaws of the chuck by meansof a long screw 18 that passes entirely through both jaws of the chuckand forms a pivot on which the blade is permitted to rock slightly inthe direction of the length of the slot between the jaws, such rockingbeing desirable in a valvegrinding tool to insure proper engagement withthe valve even when the tool holder is ield slightly inclined from itsvertical position.

In operation, the blade is placed in on gagement with the valve,preferably with the operating handle or lever 16 at either its uppermostor lowermost position. The op erator, with one hand exerts a certainamount of pressure on the head 3 thereby to hold the valve firmly to itsseat, while with the other hand he swings the lever 16 verticallythrough a very. small are, preferably only suiliciently large to causethe gear 14 to rock in engagement with the first two teeth of the rack.After this rocking motion has been continued long enough to sufficientlygrind the valve in that position, the lever is moved a short distance upor down as the case may be, so as to bring the next pair of teeth or thegear and rack into mesh, thus moving the valve to a new position,Whereupon the lever is again given a series of short up and downreciprocations, thus grinding the valve in the new position. Thisalternate advancement and reciprocation of the lever is continued untilthe rack has reached the limit of its movement.

From the foregoing it will be seen that I have provided a tool in whichthe distance through which the valve moves upon its seat will always bethe same for every movement of the operating handle through a given are,regardless of the angular position of the lever with respect to thereciprocating member. l have found tl: t by means of this particularcombination of elements, the power is transmitted to the valve-grindingblade more evenly and smoothly, so that there is no more tendency forthe blade to jump out of place, than With any other combination.

Having thus described my invention, What I claim is:

l. A tool oli'the class described o0mprising a housing, a spiral shattsupported for rotation in said housing and adapted to 0s cilla-te over aplurality of arcs of predeterminable magnitude, a reciproc-able memberwithin the housing engaging said shaft and adapted to rotate same inboth its up-anddown movements, a rack carried by said reciprocablemember extended outside the housing, a gear adapted to be rocked over aseries of given arcs supported exteriorly of said housing in mesh withsaid rack, and means for so rocking said gear.

2. A tool of the class described comprising a housing, a spiral shaftsupported for rotation in said housing and adapted to oscillate over aseries of arcs of predetermin able magnitude, a reeiproeable memberWithin the housing encircling said shaft and adapted to rotate the samein both its up and-down movements, a rack carried by said reciproeablemember, a Wheel supported exterlorly of sald housing, teeth on saidWheel meshing with said rack and adapted to be oscillated progressivelythereover 1n given numbers at a time, and, a lever secured to said Wheelradially thereof for so oscillating said teeth.

In testimony whereof I have signed .my name to this specification. I

OSCAR I). HAPGO'OD.

